Drawing press and reversing mechanism for such presses and similar machines



C` R. GABRIEL.

um 23, m23.

DRAWING PRESS AND REvERsING ME 4cHANrs-M FOR sucH PREss FILED JAN. 8, 1920.

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C. R. GABRIEL. DRAWING PRESS AND\REVERS|NG MEcHAN|sM PoR sucH PRESSES AND SlMrLAR MACHINES.

F|LED JAN. 8, 1920. 3 SHEETS-SHEET 2 INVENTOR By torneys,

3mm. gwdg Jam. 23, R923.

C. R. GABRIEL.

DRAw Ns PRESS AND REVERSING MECNANI sM FOR SUCH PRESSES AND SIMI LAR MACHINES.

F LED JAN. 8 1 920 3 SHEETS-SHEET 3 one side of the plunger 10, preferably upon the front and back sides of the plunger, there being provided for example, a rack and pinion 19, 20 on one side, and a second rack 22 on the side of the plunger 10 opposite the rack 19. A driving pinion 23 corresponding to the driving pinion 20 is providn ed in conjunction with the rack 22. On the two racks 19, 22 there is obtained a width of tooth corresponding with the width of tooth upon a single rack having a width equal to the combined width of the racks upon the two sides of the plunger. The teeth upon the plunger, and the corresponding pinion teeth may be given the requisite strength, thus having the necessary factor of safety, without unduly widening the rack, and other press parts.

The two pinions 20, 23 are preferably geared together, so as to move in unison, by means of companion gears 26, 27, mounted fast upon the `pinion shafts 29, 30, carrying the pinions 20, 23 respectively. The teeth on one rack are preferably staggered with relation to thosel on another, as this gives a more even or uniform drive, this being of considerable importance in drawing presses.

The pinions 20, 23 are driven from the motor 16, or other driving device, through a train of reduction gears 33, 34, 35, 36, 37, and 38, connected to the shaft of one of the driving pinions, as for example, the shaft 30, the driving force being transmitted to the` other driving pinion 20 through the companion gears 27, 26. For transmitting tobetter advantage, the large driving forces used, the gears'26 and 27 and 33 to 38 inclusive arev preferably duplicated on the shafts carrying them.

The motor 16 acts to drive the pinions 20, 23 in` onedirection to lift the plunger 10, and also to drive the plunger 10 toward and i' Aagainst its work, in the opposite direction.

The reversal of the motor 16, or other driving part, may be accomplished in' any suitable manner.

Preferably, however, thereversal of the motor l16, or other driving part is accomplished by any suitable reversing means, as for example, a reversing switch 50, and automatically operated means 51 for controlling the operation of said reversing device or switch. Moreover the arrangement of the reversing switch actuating means is preferably such that it is moved by, and in constant or timed relation with, the reciproeating part or plunger 10.

The means for actuating the reversing de vice, conveniently comprises one or more dogs or strikers 55, 56, mount-ed upon a movable carrier ,or slide 58. The frame may be providedwith a slideway 59, with a dovetail slot. for the carrier or slide 58. The carrier or vslide 58 is conveniently reciprocated by means of a rack 62 andy pinion 63,

drivingmeans from and preferably through a reduction gearing comprising gears 66, 67, 68, and 65), the lat ter being preferably in mesh with a` rack 7() formed or fixed upon the plunger 10, this rack being conveniently separate from the rack which meshes with the driving pinion, and also preferably extending beyond said driving rack at both ends as indicated at 72, 73. The gear 69 conveniently mounted upon the same shaft as one of the driving pinions, as for example the shaft 29, and is preferably loosely or idly mounted upon said shaft, for a purpose hereinafter more fully explained.

The strikers 55, 56 are adjustably mounted upon the slide or carrier 58, in order to act upon suitable tappets 80, 81, connected to the reversing switch 50, at different times, in order that the stroke of the plunger may be varied. As drawing presses usually stand vertical, and as these long-stroke presses are ordinarily 15 to 20 feet and more high, it is desirable to have the strikers 55, 56 within convenient reach of a workman or attendant standing upon the Hoor of the shop, and the reduction gearing permits of the motion of the slide or carrier 58 being so reduced that both of the strikers may be in convenient reach. The reduction of the motion of the slide or carrier 58 also admits of the said carrier boing mounted upon a relatively short slide which may be readily formed upon or attached to a part of the frame of the press. without projecting beyond said framework. The slide or carrier 58 is also preferably arranged to move vertically, inasmuch as itsl moving parts are least in the way of the attendant.

The racks 19 and 22 are provided with a free space 90 at their lower ends, and their length is such that the pinions may run oli from the racks when the plunger is lowered to its maximum extent. Should the reversing means fail to reverse the motor, the pinions may run off the racks at either end, and hence turn idly in the spaces 90 or at the end of the racks, thereby preventing the jamming the plunger against either the head of the press, or the bed of the press, and crushing or straining said parts.

In order that the strikers may not lose their constant or timed relation to the movements of the plunger, the rack 70 has its ends 72, 73 extended beyond the ends of the racks' 19, 22, so that the gear 69 relnains in mesh with said rack 70 upon occasions when the pinions 20, 23 run off'of the racks 19, 22. Moreover, where the gear 69 is mounted upon the shaft carrying the pinion 20, the said gear 69 is mounted loosely 0r idly upon said shaft 29, so that the pinion 69 will not turn with the pinion 20, after the pinion 20 has run ofi' of the rack, and continues to rotate.

rooatory plunger, a rack and pinion drive, a reversing,- device, and means `or actuating; said reversingdevice, comprising' a rack and pinion mounted idly along side of the driving pinion, said latter rack and pinion heing adapted to remain idly in mesh when the drivingi rack and pinion accidentally pass out or' mesh, whereby said raclr and pinion of said actuating mechanism remain in timed relation with said plunger.

13. A press or the like comprising a reciprocatoiy plunger, a racl: and pinion drive, a reversing device, and means Jfor actuating said reif'eising` device Comprisingn a rack separate from said driving rack and an idler or loose pinion, said latter rack and pinion being adapted to remain idly in mesh when the driving rack and pinion aoeidentally pass out or mesh, whereby said rack and pinion of said actuating mechanism remain in timed relation with said plunger.

A press or the like comprising a reciprecaiory plunger, a rack and pinion drive. a revers l said reversing device comprising a rack and pinion adapted to remain idly in mesh when the. driving' rack and pinion accidentally pass out oi'f mesh, whereby said rack and pinion of said actuating mechanism remain in timed relation with aid plunger. and a reduction gearing` in mesli. with said latter pinion.

l5. A press or the like having a recip1^oeatery plunger, means i'ior drivin;r said plunger, a reversing device. means for actuating said reversingr device, comprising:r a part having areduced corresponding motion as regards the plunger, and means for adjustingv the time of action of said actuating means on said reversingT device.

.in Witness whereof, l have hereunto signed my name.

CHARLES R. GABRIEL.

device. and means ior aetnal'ing 

